Comparison amongst Bio Digester ,Septic Tank & STP


S.No. FEATURES SEPTIC TANK BIO DIGESTER STP
1 PROCESS ANAEROBIC without any treatment FRP Material with catalyst in form of AMI(DRDO approved-Anarobic Molecular Inoculum) added to ANAEROBIC chamber with PVC matting to increase surface area of digestion. Combination of Anarobic & Aerobic
2 BOD REDUCTION AT OUTLET Approx 30% REDUCTION approx 65-70 % REDUCTION approx 90 % REDUCTION
3 SLUDGE HANDLING Numerous times in month Never as Bacteria digests complete sludge in the tank. In packaged type- Once in a year . In Coventional every week.
4 EASE OF INSTALLATION & COMMISSIONING Quite difficult as the technical requirement of digester may not be easy for village mason to understand. Very easy Only specialized agency need to be deployed
5 O & M - Operation & Maintancance Cumbersome, in-humane , time-consuming and very often. 1. High & easy- NO POWER required 2. Dosing of Anarobic Molecular Bacteria required - ONE TIME DOSING required 1. Continuous power supply required for Aerobic chamber 2. Sludge Handling is difficult.
6 Cost of ownership 1.25X X 5 X
7 Life Moderate Very high Depends purely on O & M.
8 AIR QUALITY BAD ODOUR ODOURLESS ODOURLESS
9 EFFLUENT WATER TO BE DISPOSED OFF IN SOAK PIT,AWAY FROM SITE GOOD ENOUGH FOR GARDENING GOOD ENOUGH FOR GARDENING
10 COMMISSIONING & INSTALLATION Good Waterproofing & workmanship required in Brick work septic tank . Also time consuming. Modular, easy to install. Modular, easy to install. In Convetional type -Good Waterproofing & workmanship required in Brick work
11 TOTAL TIME FOR INSTATTION & COMMISSIONING usually 2-4 weeks depending on size. Max 2 days 15 days